One of the early leaders of geology in Britain, Adam Sedgwick was born in the Yorkshire village of Dent in 1785. Attending Trinity College Cambridge, he was ordained as clergyman and in 1818 was appointed to the Woodwardian Chair of Geology, which offered a small stipend. Despite having little prior knowledge of the subject, Sedgwick soon commenced fieldwork, offered regular annual lectures, and joined with John Stevens Henslow, William Whewell and others to build up the University's reputation in the sciences. Sedgwick's research soon centred on the older rocks of Britain, and was instrumental in establishing the 'Cambrian' and 'Devonian' divisions of the geological column. He was a liberal reformer and a strong evangelical throughout his life.

Having attended a thorough course at Edinburgh, Darwin did not attend more than a few geology lectures at Cambridge, but came to know him through informal gatherings. In the summer of 1831 Darwin accompanied Sedgwick on a tour of the older fossil-bearing rocks of Wales. This provided his main training in field geology before the Beagle voyage and 'set him up wonderfully', as he told Henslow in a letter, 'Tell Prof: Sedgwick he does not know how much I am indebted to him for the Welch Expedition.-- it has given me an interest in geology, which I would not give up for any consideration.-- I do not think I ever spent a more delightful three weeks, than in pounding the NW mountains.' Darwin and Sedgwick continued to correspond in later years, discussing matters relating to the Geological Society of London and posting their latest books.

This cordial relationship was tested to the limit when Darwin sent a copy of the first edition of Origin. Sedgwick had long battled against evolutionary theories, believing that transmutation was an unphilosophical speculation which undermined the moral status of humanity. He read the work of his one-time pupil with an explosive mixture of anger, alarm and disappointment: 'You have deserted—after a start in that tram-road of all solid physical truth—the the true method of induction—& started up a machinery as wild I think as Bishop Wilkin’s locomotive that was to sail with us to the Moon'. However, the two men continued to exchange friendly letters. In 1870 they met for the last time, and Sedgwick took Darwin on a long tour of the vastly expanded geological collections at Cambridge. Darwin was exhausted, lamenting to Joseph Hooker: 'Is it not humiliating to be thus killed by a man of eighty-six, who evidently never dreamed that he was killing me?'

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His first letter to JSH since December. Recounts his seasickness, geologising and marine collecting at St Jago [Santiago, Cape Verde Is.]; his first tropical forest. Collecting small insects from the tropics. His Welsh trip with Sedgwick has been extremely valuable.

Thanks CD for theOrigin; AS has read the book "with more pain than pleasure". CD has deserted "the true method of induction" and many of his wide conclusions are "based upon assumptions which can neither be proved nor disproved". His "grand principle –natural selection" is "but a secondary consequence of supposed, or known, primary facts".